Hello Thanks for query .You had burning urination with increased frequency for urination since couple of days and now have high grade fever with chills . . All these symptoms are suggestive of Acute UTI . Please consult qualified Urologist for clinical and digital rectal examination and get following basic tests done to confirm the diagnosis. 1) Urine routine and culture. 2) Ultrasound scanning of abdomen and pelvis. In the mean while take broad spectrum antibiotics like Cefixime along with urinary antiseptic like Nitrofurantoin twice daily and urine alkalizer thrice daily .Later on switch on to appropriate antibiotics as per culture report. Get the prescription of medicines from your family Physician. Ensure to drink more water .To keep your urine dilute This will help to control dysuria. Further treatment will depend upon result of these tests and final diagnosis. Dr.Patil.